Bluish sulphurized indophenol-benzidine dye and process of making the same



T Patented Dec. 15, 1925.

UNITED STATES 1,565,736 PATENT OFFICE.

LOUIS HMS, IABIS, FRANCE, AN D EMIL REBER. OF BASED, swrrznnnannns- BIGNOBB T0 SOCIETY LAND.

OI CHEMICAL INDUSTRY IN BASLE, 0]! BASEL, SWITZEB BLUISH sunrnunrznn mnornnnon-nnuzmmn nrnnmi raocnss or MAKING 'rnn same. V

I0 Drawing.

To all whom it may concern:

Be it known that we, 'LoUIs Haas, of Paris, France, and EMIL REBER, of Basel, Switzerland, the first a citizen of the Republic of France, and the second a citizen of the Re ublic of Switzerland, have invented new an useful Bluish Sulphurized'Indophenol- Benzidine' Dyes and Process of Making the Same, of which the following is a full, clear,

and exact specification.

It is known that very valuable dyestuffs are obtained by treating with sulphurand alkali metal polysulphides the leuco-derivatives of the indophenols which are obtained by condensation of nitrosophenolswith car- .scribed in the first example. The dyestufi' bazole.

The literature concerning these sulphur dyes mentions that the best results are obtained by a slow sulphuration at low temperature and in resence of alcohol.

We have foun that, in contradistinction to the process with alcohol, a rapid sulphuration 'gives also very valuable new dyes n a good yield if the sulphuration of these leuco-indophenols takes place at higher temperature and in presence of benzidine which enters the dyestufi molecule, with or Without addition of a fusing agent, as for instance, a phenol or a naphthol. These new dyestuffs ma be dyed'in a sodium sulphide or sodium hy rosulphite bath. They produce on the vegetable fibre beautiful blue shades with indigo-like greenish reflexes very fast to washing to light and to chlorine.

Emample 1. I 27, 2 parts of the indophenol obtained by condensation of nitrosophenol with carbazole are introduced into the molten mixture of 29 parts of crystallized sodium sulphide and- 36 parts of stirred until the indophenol is completely reduced. Thewhole mass is then 'dried in a vacuum, pulverized and well mixed with 9, 2 parts of-benzidine. The-mixture thus obtained is baked at 180-190 C. until no more hydrogen sulphide is developed.

After cooling the product is finely ground and extracted with a dilute solution of so dium sulphide to eliminate sulphur and other dyestufi dyes cotton in blue Application filed Kay 7,

' amples.

pulverized sulphur and 1923. Serial No. 637,322.

shades with indigo like reflexes, very fast to washing, to light, and to chlorine.

Ewample 2.

thus obtained is very like the coloring matter 7 described in the preceding example.

Example 3. v

.27, 2 parts of the indophenol obtained by condensation of nitrosophenol with carbazole' are introduced into the molten mixture of 29 parts of crystallized sodium sulphide, 36 parts of pulverized sulphur and 9, 2 parts of benzidine. The mass is stirred until the indophenol is reduced, vacuum dried, ulverized and well mixed with 8 parts 0 phenol. Then the product thus obtained is heated to about 180 C. until no more hydro en sulphide is developed, and treated as escribed in the preceding ex- Example 4.

27, 2 parts of the indophenol obtained by condensation of nitrosophenol with carbazole are introduced into a mixture of 42 parts of crystallized sodium sul hide, 44 parts of sulphur. 4.9-parts of enzidine and 4.6 parts of a-naphthol. The whole is stirred until the indophenol is completely reduced, and treated as described in the preceding exam les. I

Instead o phenol and a-naphthol other substances, as for example, ,B-naphthol, resorcin, vetc., may be used. The dyestufi's thus obtained are very like those described in the preceding examples.

What we claim is:

1. The process of making new dyes containingsulphur which consists in sulphurizing I the leuco-deri ativesof the indophenols obtained by condensationnf nitrosophenols with carbazole in taining s iz ing the lance-derivatives ofvfl indofiph I with carbezole in presence of benzidine.

2. The process of'makin new dyes con- I taining sulphur which conslsts in sulphurizing the leuco-derivatives of the indophenols obtained by condensation of nitrosophenols presence of benzidlne and of a fusing agent. y

3. The process of making new dyes con izing the leuco-derivatives of the indophemetal sulphides phur which consists in sulphui nolsobtained by condensation of nitrosophenols with cerbla zole in presence of benzidine, constituting in a dry state dark blue powders insoluble in water, soluble in concentrated sulphuric acid with blue colorations, producing with sodium hydrosulphite andcaustic soda yellow vats, and with alkali eenish vets, which dye the vegetable fibre 1n blue shades very fast to washing, to light, and to chlorine.

In testimony whereof, we have hereunto set our hands] 7 nols obtained by condensation of nitroso- Peris,' this 19thdeyofAp ri11923.

phenols with carbazole in presence of ben- I zidinesnd phenol. v

v 4. The'new dyestufl's obtained by sulphur- I LOUIS HAAS;

April 1923.

Besel, this-23d day of EMEREBER. 

